Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f838f35ca4651ee…

MALICIOUS

PDF

106.8 KB Created: 2021-08-17 01:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3a840e9d5b98c0317a79830551e5eb3 SHA-1: 7a8c6b1cf078b173dc5185380fe9f9e78bc5349d SHA-256: 9f838f35ca4651ee3379027484490840d4557d468f8ed0916005ff7ec196ce91
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the ClamAV detection strongly suggest a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2187

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://botosani.ro/img/uploads/file/zepivazugafijaxoxapokij.pdf In PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/kaxopugovijezir.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/retinarugokebof.pdfIn PDF document text
    • http://stonebreaker.at/retifitedodi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d519052---mafotumojowusavaxadujo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4724ce67f7---dovolewagexodixisunasub.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/36361948713.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160796dc620874---wojof.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1ec969a38d620c4d5a95927ffd2b1/16013838562.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/dafafikuzu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/a6rgrpfug87aocks1d0o2j865k/wejajefaxogipa.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tdkul74m739irfccdv7b5om1r6/83087174702.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/zedorufotakamizozujiza.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e8570d5cc76197ea562724d4bb0ea21e/37254850043.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qv4ne6qb27q3ujtj60a36cln13/83603623148.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/68287333529.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/98245168361.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/8623225916.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/75533337739.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/pisomawawodilurum.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/71953858022.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098922a98cbc---xagoki.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/15714898606.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b0df92f35c785156ccc8e05079448194/nipotedoboxelolitulek.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/wudabagaduluxonukebakulap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=batman+arkham+knight+ps4+tips+and+tricksPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E99 10884 bytes
SHA-256: c4bc6fba007cae5fada8792a91f07c66fe8e15714e9602090c67926e6a495990
font_01_sfnt_off00017768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17768 17692 bytes
SHA-256: b8057e570b2031411dc494e43717024ae0c6e42f52ec28dec7dc2197673ea63f